diff --git a/core/modules/page_cache/src/StackMiddleware/PageCache.php b/core/modules/page_cache/src/StackMiddleware/PageCache.php
index b087176..b0cdf71 100644
--- a/core/modules/page_cache/src/StackMiddleware/PageCache.php
+++ b/core/modules/page_cache/src/StackMiddleware/PageCache.php
@@ -223,11 +223,11 @@ protected function fetch(Request $request, $type = self::MASTER_REQUEST, $catch
     }
 
     // Use the #cache['max-age'] if available.
-    if($response instanceof CacheableResponseInterface) {
+    if ($response instanceof CacheableResponseInterface) {
       $max_age = $response->getCacheableMetadata()->getCacheMaxAge();
-      $expire = ($max_age !== Cache::PERMANENT)? time() + $max_age : Cache::PERMANENT;
+      $expire = ($max_age !== Cache::PERMANENT) ? time() + $max_age : Cache::PERMANENT;
     }
-    else{
+    else {
       // Use the actual timestamp from an Expires header, if available.
       $date = $response->getExpires()->getTimestamp();
       $expire = ($date > time()) ? $date : Cache::PERMANENT;